Nodules are quite common with autoimmune thyroid disease. Are you sure the nodules are 2 inches and not 2 cm since nodules are, typically measured in cm?
Radiation ablation should reduce the size of the nodules, but did they tell you, depending on the dosage, it will also destroy the entire thyroid, so it won't produce necessary hormones any longer? This will cause you to be permanently hypo and in need of thyroid replacement medication.
Do you know if these nodules are producing hormones on their own? If not, they may reduce in size on their own, if your Free T4 and Free T3 can be normalized without the radiation ablation. This can sometimes be accomplished simply by adjusting the methimazole properly or changing to PTU instead.
There's also a procedure called "Block and Replace" in which anti-thyroid medication is given to block thyroid hormone production, then thyroid replacement medication is given to normalize hormone levels. This might also be a consideration and could help shrink the nodules (provided they aren't producing hormones, independently of the thyroid).